Luigi Marchese
Department of Physics
University of Oxford

In the Standard Model the Higgs boson is a very narrow resonance and therefore measuring its width is challenging. 
How can we constrain the Higgs boson total width at the LHC? Presently, the best limits on the Higgs boson total width 
at the LHC are set using the off-shell Higgs production and decay to ZZ in the four-lepton or two-lepton-two-neutrino final 
state. A review of all measurements performed by the ATLAS collaboration with Run 1 data and Run 2 data collected in 2015 and 
2016 is presented.